P0315 on Chevrolet
Crankshaft Position System Variation Not Learned
P0315 on Chevrolet vehicles indicates crankshaft position system variation not learned. Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 2500HD. The crankshaft position variation (relearn) procedure has not been completed, so the ECM/PCM lacks the reference data it needs to accurately run the misfire monitor. Each crankshaft reluctor wheel has small tooth-spacing variations; the controller must 'learn' these to tell a real misfire from normal mechanical variation. Commonly appears after an ECM replacement/reflash or crankshaft sensor/engine work. Typical repair costs on Chevrolet range from $150 to $500, depending on the specific model and root cause.
Common Causes of P0315
- •Crankshaft variation relearn not performed after ECM/PCM replacement or reflash
- •Crankshaft position sensor replaced without relearn
- •Damaged crankshaft reluctor/tone ring
- •Faulty crankshaft position sensor
- •Low battery voltage interrupting the relearn
P0315 on Chevrolet by Model
Chevrolet Silverado 2500HD(1 issue)
- 8.1L Vortec Crankshaft Position Sensor Failure - Stalling and No-Start2001-2006
The 8.1L Vortec 496 big-block, offered in the 2500HD alongside the Duramax, has a well-known crankshaft position sensor weakness concentrated on the earliest build years. The sensor sends erratic or dropped signals to the PCM, which throws ignition timing off and produces rough idle, hesitation, stalling - often when hot - and eventually a crank-no-start that clears after the engine cools. GM revised the sensor design during the run, so late trucks are far less affected. This is an 8.1L gas issue and has nothing to do with the Duramax diesel sold in the same body.
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What does P0315 mean on Chevrolet?▼
P0315 stands for "Crankshaft Position System Variation Not Learned." The crankshaft position variation (relearn) procedure has not been completed, so the ECM/PCM lacks the reference data it needs to accurately run the misfire monitor. Each crankshaft reluctor wheel has small tooth-spacing variations; the controller must 'learn' these to tell a real misfire from normal mechanical variation. Commonly appears after an ECM replacement/reflash or crankshaft sensor/engine work. On Chevrolet specifically, this code is documented across 1 model.
What causes P0315 on Chevrolet vehicles?▼
Common causes on Chevrolet: Crankshaft variation relearn not performed after ECM/PCM replacement or reflash, Crankshaft position sensor replaced without relearn, Damaged crankshaft reluctor/tone ring, Faulty crankshaft position sensor, Low battery voltage interrupting the relearn. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0315 on a Chevrolet?▼
Repair costs on Chevrolet range from $150 to $500, depending on the specific model and root cause.
Which Chevrolet models have P0315 documented?▼
Au7o has documented P0315 on 1 Chevrolet model: Silverado 2500HD.